No this is not the Dolphin/Sealion exhibit. It is either the current otter enclosure or possibly the ruffed lemur enclosure. I think the former but I may be wrong, others will hopefully be able to confirm.
I think that photo is at least 1970s, as it's of a bull California sealion. The "Round Close" pool kept Patagonian sealions from about 1976, judging from contemporary guidebooks.